250 ROYAL SOCIETY OF CANADA 



any others to be found in the neighbourhood, has attracted the attention 

 of many observers. 



Sir Wm. Logan describes the occurrences in " The Geology of Ca- 

 nada, 1863." His study was principally in connection with the fossils 

 of the included limestone from Ste. Helen's Island and He Eonde, but 

 brief descriptions are given of the other localities. Examinations solely 

 of the fossils were made in 1880 by Prof. J. T. Donald ^ and in 1890 by 

 Dr. W. E. Deeks, B.A.^ The numerous specimens from material col- 

 lected from time to time by Dr. Dawson and the classes in Geology of 

 McGill University were described by Dr. H. M. Ami, his list of fossils 

 appearing as an appendix to the " Keport on the Montreal Sheet," by E. 

 W. Ells.i A further paper on the palœontolog}^ was published in 1901 

 by Prof. Chas, Schuchert.^ The detailed examination of Ste. Helen's 

 Island made by Miss A. "W. Nolan and Miss J. D. Dixon in 1901 ^ is 

 the most important investigation undertaken to date. In order to finally 

 settle the question of the correlation of the limestone inclusions, in con- 

 nection with this investigation, an arrangement was made with Dr. H. 

 S. Williams, then of Yale University whereby he agreed to assist in the 

 work to the extent of making the palseontological determinations. For 

 this purpose, about three-quarters of a ton of the limestone was obtained 

 by blasting and this material subjected to a thorough examination by 

 Dr. Williams in his laboratory. A preliminary note on this determina- 

 tion is included in the paper by Miss Nolan and Miss Dixon. The ex- 

 amination has now been completed, and the final results are embodied 

 in the paper by Dr. Williams to be presented at this present meeting of 

 The Eoyal Society of Canada. The previously scattered information 

 about the series of igneous intnisions with wliich the breccia is associ- 

 ated, was brought together into a single paper by Dr. F. D. Adams 

 under the title : — " The Monteregian Hills, a Canadian Petrographical 

 Province." ^ Very liberal use has been made of this article for the pur- 

 poses of the present paper. A study of the dyke rocks of Mount Eoyal 

 was made by Mr. J. A. Allan, M.A., at McGill University in 1908, to 

 whose work also I am indebted. 



The present paper is based on the results of a re-examination of fhe 

 localities mentioned by Logan, together with a detailed evamination of 

 several new localities. Extensive use was also made of the collection in 



1 Canadian Naturalist, 1881. Vol. IX, New Series, p. 302. 

 2 Canadian Record of Science, 1890. Vol. IV, No. 2, pp. 104-109. 



1 Geological Sur\"ey of Canada, Vol. VII, pt. J., p. 155. 



2 American Geologist, Vol. XXVII, p. 245. 



3 Canadian Record of Science, Vol. IX, No. 1, 1903. 



4 Journal of Geology, Vol. XI, p. 239, 1903. . 



